Grinding and decorticating mill



(No Model.) 3 Sheets-Sheet 1.

. R. H. MINISTER.

' GRINDING AND DECQRTIGATING MILL. No. 284,466. Patented Sept. 4, 1883.

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(No Model.) 3 sheets-sheet 2. R; H. MINISTER.

GRINDING AND DEGORTIGATING MILL.

No. 284,466. Patented Sept. 4, 1883.

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(No Model.) 3 Sheets-Sheet 3;

R. H. MINISTER. GRINDING AND DEOORTIGATING MILL.

No." 284,466. Patented Sept. 4, 1883.

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ll'rirrinn STATES PATENT O FICE.

ROBERT "E. MINISTER, or BALTIMORE, MARYLAND.

GRINDING AND DECORTICATLNG IV I IL L.

- SPECIFICATION formi'ngpart of Letters Patent No. 284,466, dated September 4, 1883, r Application filed May 16,1883. (No model.) i

of the city of Baltimore and State of Maryland,

have invented certain Improvements in Grinding and Decorticating Mills, of which the following is a specification.

This invention relates to certain improve ments in that class of mills in which the grain. is forced out tothe grinding devices by con-- trifugalforce, as will hereinafter fully appear.

In the accompanying drawings, forming a part hereof, Figure I is a partly-sectional elevation of the machine. Fig. II is atransverse section taken on the dotted line as :aFig. I. Figs. III to XVI, inclusive, are details of the invention. v 4

Similar letters of reference indicate similar parts in all the views.

A is the outer casing tr the machine, cylin drical in shape. I

B is a cylindrical cage held stationary with in the casing A by means of brackets a. The cage Bis constructed as follows: A series of segmental plates,b,are united at their ends to form a cylinder, and the cylinder thus formed is united to central disks, 0, by means of annular sheets of metal (1 and bolts d, the said cylinder and disks having grooves intowhich the said annular sheets are inserted, as shown in Fig. I of the drawings. The segmental plates 1) (see particularly Figs. XIII and XIV) have openings 6 therein, over which arelaid staves f. The staves, one of which is shown in Figs. XV and XVI, rest in rabbets 6, (see Fig. XIII,) formed in the transverse edges of the plates, next to the openings 6, and they have projections f at their ends, which serve to keep the body of the staves slightly apart, and thus form slots 9. (Shownin Fig. II.) The body of the staves is also chamfered to make the slots gof ataperedform. The staves are held in place by means of segmental guardplates h, (see Figs. XI and XII,) which have openings 6 therein,c0rresponding in size with the ones 6. These plates are bolted to the segmental plates b by the bolts 9. (Shown only in Figs. XI and XIII.) h i O is an annular polishing-plate formed in sections or segments, the ends of which abut to complete the annular form. Each segment in place by means of the guard-plates h, which cover it. The outer edges or periphery of the sections of the polishing-plate flare outwardly (see Figs. VIII and X) to prevent the insertion of the said segments too far within the cage B, and they have projections k, which enter holes k in the plates h, prepared for them, to obviate any tendency which the said segments might have to shake or vibrate in the operation of the machine. The groove Zin the polishing-plate is used for purposes hereinafter described. 1 D is a revoluble basket formed of two concavo-conveX plates, m,attached to drivingshafts E by means of the hubs F and the studs G. This mode of connecting the con-.

cavo-convex plates on to the driving-shafts E allows for the introduction of the grain to be' ground, hulled, or polished to the interior of the basket through or by means of spouts H, i

which are riveted to the outer casing, A, and pass through the annular disks 0. The driving-shafts are supported, as is also the outer ing-pulleys K,-which may be revolved in the same direction or in opposite directions.

L L are grinding-plates in segments, held in pockets in the inner surfaces of the concavoconvex plates m, 'in which they are dovetailed by means of caps 11;, which extend overthe cor ners of the said plates, and are drawn in con tact therewith by means of bolts 0, having. lock-nuts. They are further held in their pockets by bolts p, which are welded to the backs of the said plates or extend through them, in which latter case theyhave countersunk heads,

casing, A, by the frame I, and they have drivas shown in Fig. IV of the drawings. The

grinding-plates L have roughened inner surfaces, (see Fig. VII,) the roughness being cf fected by corrugations, or by cutting, after the.

width of the spaces between the grinding-plates L and the polishing-plate O. The tension of the springs can be altered by means of screws 1', which pass through threaded portions of the frame I.

Parts of the invention not yet alluded to will be des'crib'ed and their uses set forth in the description of the operation of the machine,which is as follows: Supposing the machine to be in operation, grain to be ground, hulled, or polished is introduced through the spouts H to the interior of the basket D, and, falling upon the rapidly-revolving surface of the said basket, is thrown outward by centrifugal force. The grain in its outward movement naturally seeks the portion of the basket of greatest diameter, and thus finds its way to the spaces between the polishing-plate and the grindingplates, in passing through which it is either broken, brought to a fine state of comminution, or merely pearled, according to the width of the spaces and the character of the surfaces against which it comes in contact. The grain, after the grinding operation, is thrown against theinner surface of the cage B, when the finer particles pass through the slots 9 to the space between the said cage and the casing A and fall to the bottomof the said space, which has a funnel-shaped extension, M, through which they escape. The coarser particles of the crushed or ground grain remain in the cage and fall to the bottom thereof, from which they escape through the bottom opening, 0, which is devoid of staves f, to the central funnel, N. As the discharge takes place at all parts of the periphery of the basket D and the lower part of the cage is devoid of staves, the discharge from the lower part of the cage is not separated, as is that which impinges against the staves. I therefore slot the upper end of the funnel N, as shown in Fig. V, and place in the said funnel two spring gates or doors, 0 O, which retard to some extent the exit of the coarse portions of the grain andallow the finer to find exit through the slots.

I have shown the polishing-plate O as having smooth surfaces; but I do not limit myself to this design, as it may have corrugations or be roughened, as are the grinding-plates L.

ed with one concave-convex plate m, the same being made to revolve against a polishing-disk, which. would close the said basket and practically form a part of the casing; but this would reduce the capacity of the mill about one-half.

I claim as my invention 1. In a mill, a revoluble concavo-convex plate having a peripheral grinding-plate, a fixed surrounding perforate cage, and a fixed polishing-plate supported by the said cage, all

combined substantially as specified.

2. In a mill, the following elements, in combination, viz a fixed outer casing, a fixed perforate cage, an annular polishing-plate supported from the said cage, a revoluble basket in two sections, grinding-plates adapted to revolve in close proximity to the faces of the said polishing-plate, and means to separate the ground material into two or more bodies, substantially as specified.

3. In a mill, a fixed perforate cage, revoluble shafts which enter the said cage, and are provided at their inner ends with concavoconvex plates and at their outer ends with springs, and a fixed polishing-plate supported by the said cage, all combined substantially as specified.

-ROBERT H. MINISTER.

WVitnesses:

Enw. J. DIGGS, WM. T. HOWARD. 

